Added option to hide ScrollBox background and disabled it in TreeList to expose tree_background_color

 src/widget/container/scroll_box.rs | 6 +++++-
 src/widget/container/treelist.rs   | 4 +++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/widget/container/scroll_box.rs b/src/widget/container/scroll_box.rs
index 77d92f5..c9d6b1c 100644
--- a/src/widget/container/scroll_box.rs
+++ b/src/widget/container/scroll_box.rs
@@ -10,6 +10,7 @@ pub struct ScrollBox {
     viewport_offset_y: f32,
     viewport_offset_h: f32,
     pub show_border: bool,
+    pub show_background: bool,
     pub parent: Option<*mut (dyn Element + 'static)>,
     pub children: Vec<*mut (dyn Element + 'static)>,
 }
@@ -25,6 +26,7 @@ impl ScrollBox {
             viewport_offset_y: 0.0,
             viewport_offset_h: 0.0,
             show_border: true,
+            show_background: true,
             parent: None,
             children: Vec::new(),
         }
@@ -110,7 +112,9 @@ impl Element for ScrollBox {
         let mut quads = Vec::new();
         
         // Background
-        quads.push((self.base.x, self.base.y, self.base.w, self.base.h, crate::color::list_bg_color()));
+        if self.show_background {
+            quads.push((self.base.x, self.base.y, self.base.w, self.base.h, crate::color::list_bg_color()));
+        }
 
 
 
diff --git a/src/widget/container/treelist.rs b/src/widget/container/treelist.rs
index 11123b7..b52836b 100644
--- a/src/widget/container/treelist.rs
+++ b/src/widget/container/treelist.rs
@@ -183,9 +183,11 @@ pub struct TreeList {
 
 impl TreeList {
     pub fn new() -> Self {
+        let mut scroll_box = ScrollBox::new();
+        scroll_box.show_background = false;
         Self {
             base: Widget::new(),
-            scroll_box: ScrollBox::new(),
+            scroll_box,
             search_box: TextBox::new(String::new()).with_placeholder("Search..."),
             flat_keys: Vec::new(),
             annotations: Vec::new(),